138507599 has 2 divisors, whose sum is σ = 138507600. Its totient is φ = 138507598.

The previous prime is 138507583. The next prime is 138507617. The reversal of 138507599 is 995705831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138507599 - 2⁴ = 138507583 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138507199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69253799 + 69253800.

It is an arithmetic number, because the mean of its divisors is an integer number (69253800).

Almost surely, 2^138507599 is an apocalyptic number.

138507599 is a deficient number, since it is larger than the sum of its proper divisors (1).

138507599 is an equidigital number, since it uses as much as digits as its factorization.

138507599 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 340200, while the sum is 47.

The square root of 138507599 is about 11768.9251420850. The cubic root of 138507599 is about 517.3977474621.

The spelling of 138507599 in words is "one hundred thirty-eight million, five hundred seven thousand, five hundred ninety-nine".